Question

Assertion Current stops flowing when $E_{cell}=0.$

Reason: Equilibrium of the cell reaction is attained

• A. Both assertion & reason are false.
• B. Both assertion and reason are true and reason is the correct explanation of assertion.
• C. Both assertion and reason are true but reason is not the correct explanation of assertion.
• D. Assertion is true but the reason is false.
• E. Assertion is false but the reason is true.

Answer 1

The correct option is B Both assertion and reason are true and reason is the correct explanation of assertion.

Solution: Assertion:At each electrode-electrolyte interface, there is a tendency of the metal ions from the solution to get deposited on the metal electrode, trying to make it positively charged. At the same time, the metal atoms of the electrode tend to go into the solution as ions and leave behind the electrons at the electrode, trying to make it negatively charged.

For the cell there is a separation of charges
between there uodes and depending on
the tendencies of the two opposing reactions,
the electrode may be positively or negatively
charged.


A potential difference develops between the
electrode and the electrolyte called electrode
potential, which will lead to the cell potential
developing.

$E_{cell}=E_{cathode}-E_{anode}$

For the react to be spontaneous,
$E_{cell}shoutohaveapositivevalueand({\Delta }_r{G}_{cell}$

should be negative.

At equilibrium,$E_{cell}$ = 0, as current stops

flowing.

So, $E_{cathode}=E_{anode}$

Hence, the current stops flowing when
$E_{Cell}=0$ because equilibrium of the cell
reaction is attained.


Thus the assertion is true.


When current stop flowing, $E_{Cell}=0,$ hence, equilibrium of cell reaction achieved.



Thus the reason is true.


Hence, both assertion and reason are true and the reason is the correct explanation of assertion.